Reese Witherspoon won't pose for sexy photo shoots to promote her films.

"If actresses take their clothes off, they objectify themselves," she tells the UK edition of Glamour. "I am flabbergasted by how many legitimate actresses do it."

Reese Witherspoon covers Marie Claire magazine

Witherspoon, 31 - who shares custody of Ava, 8, and Deacon, 4, with ex-husband Ryan Phillippe - adds that she tries to avoid the pitfalls of a Hollywood lifestyle. "I am a role model for my children," she says.

"Hollywood is one of those endless competitions," she says. "It's a race towards nothing. I just want to be the best version of myself that I can be."